Fix scientific floating point construction represention

[aishwaryaanegundi]

This PR modifies the library to add decimal point to scientific floating point.

For example:

Now:
3e-5 would be written as 3e-05
With changes:
3e-5 would be written as 3.0e-05

These changes are needed to avoiding reading scientific floating points read as string from yaml which is based on yaml 1.1. yaml 1.1 do not regard this !float 3e-5 as floating type. Where as ruamel.yaml is based on yaml 1.2 which treats them as float

Our requirement is to be able to have a yaml file that is consistent with both both libraries